GPS Coordinates of Airports: How Latitude and Longitude Position Aviation

Every airport in the world has a precise GPS position — a latitude and longitude that places it exactly on the globe. These coordinates underpin modern aviation navigation, instrument approach design, and airspace management.

How airport coordinates work

Airport coordinates are given as latitude (north/south from the equator) and longitude (east/west from the Prime Meridian at Greenwich). Seattle-Tacoma International (SEA) sits at approximately 47.4502° N, 122.3088° W. Sydney Kingsford Smith (SYD) is at 33.9461° S, 151.1772° E.

Uses in aviation navigation

Aircraft navigation computers use airport coordinates extensively:

• Flight planning — great circle routes are calculated from origin to destination coordinates
• Instrument approaches — GPS approach procedures reference exact runway threshold coordinates to guide aircraft in low visibility
• Terrain awareness — GPWS (Ground Proximity Warning System) uses airport coordinates to anticipate landing

Geomagnetic declination and coordinate shifts

Airport coordinates are fixed to the Earth's surface and don't change unless the airport physically expands or is relocated. However, the magnetic variation at an airport — the difference between true north and magnetic north — changes slowly over time as the Earth's magnetic field shifts. This is why runway heading designations occasionally need to be updated even when the physical runway does not move.